Crossword Genius

Thing to write about street eatery (6)

Ross

I believe the answer is:

bistro

I'm a little stuck... Click here to teach me more about this clue!

'eatery' is the definition.
(I've seen this before)

'thing to write about street' is the wordplay.
I cannot really understand how this works, but
'street' could be 'st' (abbreviation) and 'st' is found in the answer.
The remaining letters 'biro' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for bistro that I've seen before include "family concern perhaps" , "somewhere to eat" , "Small inexpensive eatery" , "Small French bar and restaurant" , "'Small, inexpensive restaurant (6)'" .)

I've seen this clue in the Sydney Morning Herald.
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